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Alarm Threshold Protection by Default: if the voltage < 4.5V or the voltage >13.8V and the current > 5.1A , there would make a alarm and shut off output if the above occurs.(The default alarm threshold protection can be amended according to your specified requirements)

Range of High Voltage Protection Threshold: > 1.0~13.8V; By default, there would be sort of protection if the voltage is greater than 13.8V.

Range of Low Voltage Protection Threshold: < 0.5~24V; By default, there would be sort of protection if the voltage is less than 4.5V.

Range of Over-current Protection Threshold: > 0.5A~5.1A; By default, there would be sort of protection if the current is greater than 5.1A.

Note:

If there were nothing displaying or no sound, which might fail to power up the USB meter, please check if the USB port is connected well.

If there were inaccurate tested capacitance, please note there are different capacitance computing methods for charging cell phone or discharging power bank.